Electronic damping of a vibrating dipole near a metal

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Abstract
The authors present a model calculation of the non-radiative damping of a dipole outside a metal surface. The model treats simultaneously several mechanisms of electronic excitation in the metal and the net damping rate is not simply additive. The dipole frequency is a free parameter so one can examine the decay of both electronic and vibrational excitations. In the low-frequency limit, a friction parameter can also be deduced from their results. Its evaluation is compared with a recent alternative calculation.